275 lines
8.6 KiB
C
275 lines
8.6 KiB
C
/****************************************************************************
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* boards/arm/stm32/shenzhou/src/stm32_touchscreen.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/board.h>
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#include <nuttx/irq.h>
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#include <nuttx/spi/spi.h>
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#include <nuttx/input/touchscreen.h>
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#include <nuttx/input/ads7843e.h>
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#include "stm32.h"
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#include "shenzhou.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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#ifdef CONFIG_INPUT_ADS7843E
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#ifndef CONFIG_INPUT
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# error "Touchscreen support requires CONFIG_INPUT"
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#endif
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#ifndef CONFIG_STM32_SPI3
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# error "Touchscreen support requires CONFIG_STM32_SPI3"
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#endif
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#ifndef CONFIG_ADS7843E_FREQUENCY
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# define CONFIG_ADS7843E_FREQUENCY 500000
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#endif
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#ifndef CONFIG_ADS7843E_SPIDEV
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# define CONFIG_ADS7843E_SPIDEV 3
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#endif
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#if CONFIG_ADS7843E_SPIDEV != 3
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# error "CONFIG_ADS7843E_SPIDEV must be three"
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#endif
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#ifndef CONFIG_ADS7843E_DEVMINOR
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# define CONFIG_ADS7843E_DEVMINOR 0
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct stm32_config_s
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{
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struct ads7843e_config_s dev;
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xcpt_t handler;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADS7843E driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t isr);
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable);
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static void tsc_clear(FAR struct ads7843e_config_s *state);
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static bool tsc_busy(FAR struct ads7843e_config_s *state);
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static bool tsc_pendown(FAR struct ads7843e_config_s *state);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the ADS7843E
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* driver. This structure provides information about the configuration
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* of the ADS7843E and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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static struct stm32_config_s g_tscinfo =
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{
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{
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.frequency = CONFIG_ADS7843E_FREQUENCY,
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.attach = tsc_attach,
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.enable = tsc_enable,
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.clear = tsc_clear,
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.busy = tsc_busy,
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.pendown = tsc_pendown,
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},
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.handler = NULL,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADS7843E driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* pendown - Return the state of the pen down GPIO input
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*/
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static int tsc_attach(FAR struct ads7843e_config_s *state, xcpt_t handler)
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{
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FAR struct stm32_config_s *priv = (FAR struct stm32_config_s *)state;
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/* Just save the handler for use when the interrupt is enabled */
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priv->handler = handler;
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return OK;
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}
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static void tsc_enable(FAR struct ads7843e_config_s *state, bool enable)
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{
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FAR struct stm32_config_s *priv = (FAR struct stm32_config_s *)state;
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/* The caller should not attempt to enable interrupts if the handler
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* has not yet been 'attached'
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*/
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DEBUGASSERT(priv->handler || !enable);
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/* Attach and enable, or detach and disable */
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iinfo("enable:%d\n", enable);
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if (enable)
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{
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stm32_gpiosetevent(GPIO_TP_INT, true, true, false,
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priv->handler, NULL);
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}
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else
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{
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stm32_gpiosetevent(GPIO_TP_INT, false, false, false,
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NULL, NULL);
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}
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}
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static void tsc_clear(FAR struct ads7843e_config_s *state)
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{
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/* Does nothing */
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}
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static bool tsc_busy(FAR struct ads7843e_config_s *state)
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{
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/* Hmmm... The ADS7843E BUSY pin is not brought out on the Shenzhou board.
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* We will most certainly have to revisit this. There is this cryptic
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* statement in the XPT2046 spec: "No DCLK delay required with dedicated
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* serial port."
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*
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* The busy state is used by the ADS7843E driver to control the delay
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* between sending the command, then reading the returned data.
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*/
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return false;
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}
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static bool tsc_pendown(FAR struct ads7843e_config_s *state)
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{
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/* XPT2046 uses an an internal pullup resistor. The PENIRQ output goes low
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* due to the current path through the touch screen to ground, which
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* initiates an interrupt to the processor via TP_INT.
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*/
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bool pendown = !stm32_gpioread(GPIO_TP_INT);
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iinfo("pendown:%d\n", pendown);
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return pendown;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_tsc_setup
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*
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* Description:
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* This function is called by board-bringup logic to configure the
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* touchscreen device. This function will register the driver as
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* /dev/inputN where N is the minor device number.
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*
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* Input Parameters:
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int stm32_tsc_setup(int minor)
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{
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FAR struct spi_dev_s *dev;
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int ret;
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iinfo("minor %d\n", minor);
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DEBUGASSERT(minor == 0);
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/* Configure and enable the ADS7843E interrupt pin as an input. */
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stm32_configgpio(GPIO_TP_INT);
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/* Get an instance of the SPI interface */
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dev = stm32_spibus_initialize(CONFIG_ADS7843E_SPIDEV);
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if (!dev)
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{
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ierr("ERROR: Failed to initialize SPI bus %d\n",
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CONFIG_ADS7843E_SPIDEV);
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return -ENODEV;
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}
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/* Initialize and register the SPI touschscreen device */
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ret = ads7843e_register(dev, &g_tscinfo.dev,
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CONFIG_ADS7843E_DEVMINOR);
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if (ret < 0)
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{
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ierr("ERROR: Failed to initialize SPI bus %d\n",
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CONFIG_ADS7843E_SPIDEV);
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/* up_spiuninitialize(dev); */
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return -ENODEV;
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}
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return OK;
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}
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#endif /* CONFIG_INPUT_ADS7843E */
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